Automatic train-stop.



I. L. CLARK. AUTOMATIC TRAIN STOP.

APPLICATION FILED PERM, 1914. 1 124,293 Patented Jan. 12, 1915.

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I. L. CLARK.

AUTOMATIC TRAIN STOP.

' APPLICATION FILED PEB.24, 1914. 1,124,296. Patented Jan. 12, 1915.

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IRVING LEWIS CLARK, OF NEWARK, NEW JERSEY.

AUTOMATIC TRAIN-STOP.

Application filed February 24, 1914.

To an whom it may concern:

Be it known that I, IRVING LEWIS CLARK, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Automatic Train-Stops; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

} This invention relates to new and useful improvements in automatic train stops, and has for its principal object to provide a device by means of which a locomotive may be stopped automatically without the necessity of operating the throttle valve.

Another object of this invention is to provide a simple and elfective device by means of which a train traveling at a high rate of speed may be stopped without causing i11- jury to the rolling stock or passengers.

. A still further object of this invention is to provide a train stop which may be controlled by the semaphore signals or from a lever in the operators car.

Still another object of this invention is to provide a device which will automatically shut off the steam and also apply the air to the brakes and thereby bring the train to a full and complete stop.

lVith the above and other objects in view, the invention consists in the novel combination and arrangement of parts which will be fully set forth in the following specification and accompanying drawings, in which,

Figure l is a side view of a locomotive showing parts broken away to clearly illustrate the attachment, Fig. 2 is an enlarged detail sectional view of the valve which controls the flow of steam to the cylinders. Fig. 3 is a sectional view of the operating rod taken through the lug which controls the operation of the air brakes, Fig. 4 is a sectional view taken on line ()'6 of Fig. l, and Fig. 5 is an enlarged detail sectional view of the shoe which travels on the track trip.

Referring now to the drawings by characters of reference, the numeral 1 designates as an entirety, a locomotive of the usual construction having the ordinary cab 2, the smoke box 3 and steam pipe 4 which Specification of Letters Patent.

Patented J an. 12, 1915.

Serial No. 820,694.

leads from the steam dome 5 to the cylinders 6 of the locomotive.

Intermediate the steam dome 5 and the cylinders 6 is provided the valve designated generally by the numeral 7 which is located in the smoke box as illustrated in Fig. 1. This valve 7 comprises the cylinder 8 having slidable therein the piston 9 which is provided with the usual piston rings 10 to form a tight joint and prevent any leakage of steam through the valve and around the piston. This valve casing 8 is provided near one end with the apertures 11 which are diametrically opposite each other and are arranged to permit the steam passing through the steam pipe 1 to enter the valve and pass therethrough on its way to the cylinders.

A suitable operating rod 12 is secured to the piston and extends through the aperture 13 formed in the casing closure 14 and projects downwardly as illustrated in Fig. 1 to a point between the rails where it terminates in the shoe 15 which is adapted to be engaged by the track trip and force upwardly when the device is in use.

Secured to the casing of the valve 7 is provided the spring catch 16 which terminates in the angular extension 17, the use of which will appear as the description proceeds.

A suitable ear 18 is formed on the spring 16 on the side opposite the extension, and is arranged to pivotally secure the rod 19 which extends rearwardly with relation to the locomotive and into the cab, and is adapted to provide a means to reset the device in position for operation.

A plurality of teeth 20 are formed on the operating rod 12 near the point where it enters the valve 7, and are arranged to be engaged by the angular extension 17 on the spring 16 to hold the rod in the raised position after the same has been forced upwardly.

An extension 21 is formed on the rod 12 intermediate the teeth 20 and the lower extremity of said rod and is provided with the beveled face 22, the use of which will appear as the description proceeds.

A suitable collar 23 is supported on the frame of the locomotive in any suitable manner and is arranged to act as a guide for the lower end of the rod 12 to prevent the same from coming out of alinement and thereby insure the proper working of the device at all times.

A plurality of collars 24 are supported by the frame of the locomotive in any suitable manner and are arranged in longitudinal alinement with relation to said locomotive. These collars are provided to slidably support the rod 25 which operates a suitable air valve 26 to control the operation of the brakes at the time the valve is being operated'. A suitable enlarged portion 2( is formed near one end of the bar 25 and is to stop a train provided with an automatic stop mechanism, constructed in accordance with this invention, the track trip mechanism is set so that when a train having the previously described mechanism mounted thereon, passes over the same the shoe 15 on the operating rod 12 will engage the upper surface of the trip and be forced upwardly, thus forcing the rod 12 upwardly and in turn pushing the piston 9 toward the upper end of the cylinder 8 which will gradually close the openings in the pipe 4 and prevent the passage of steam from the steam dome to the cylinders of the locomotive. The piston is held in its locked uppermost position by means of the spring 16, the angular end of which engages the teeth 20 and prevents the device from falling when the end of the rail 30 is reached. During the time that the piston 9 is being forced toward the upper end of the cylinder 8, the beveled surface 22- of the extension 21 is passing upwardly through the slot 28 formed in the widened portion 27 of the bar 25 which will force the bar toward the rear of the locomotive against the tension of the spring 29 and thereby operate the piston within the cylinder 26 and automatically apply the air brakes. When it is desired to reset the device after the locomotive has stopped, the

Y bar 19 is pulled from the interior of the cab and will, release the extension 17 on the spring 16 from its position beneath the teeth 20 and permit the piston 9 to descend in the cylinder 8 and thus open the passage through the pipe 4:.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that such changes may be made in the combination and arrangement of parts as will fall within the spirit and scope of the invention as claimed.

Having thus described my invention, I claim:

1. The'combination with a locomotive having a steam dome, a pair of cylinders and a steam pipe connecting the steam dome with the cylinders, of a valve interposed in the steam pipe between the steam dome and the cylinders,a vertically slidable rod for actuating said valve, means to lockthe valve in its closed position, means extending into the cab of the locomotive to release the locking means, a lug intermediate the ends of the rod, said lug being provided with an angular face, a bar slidable longitudinally with relation to the frame of the locomotive, and adapted to be controlled by the lug, a valve in the air brake system the bar being connected to the valve in the air brake system whereby the brakes may be applied when the steam is cut ofi.

2. In a device of the character described the combination with a locomotive having a steam dome, a pair of cylinders, and a steam pipe connecting the steam dome and the cylinders, of a valve interposed in the steam pipe between the steam dome and the cylinders, said valve being adapted to control the flow of steam through the pipe, a vertically slidable rod to actuate the valve, means on the rod to engage a track trip, a plurality of ratchet teeth formed on the rod intermediate its ends, a spring secured to the valve casing and adapted to engage the ratchet teeth, a bar connected to the spring and extending into the cab of the locomotive to control the spring, means connected with the rod to automatically apply the air brakes of the train when the steam is being out off in the locomotive, and a spring to return the air brake controlling means to its normal position.

3. The combination with a locomotive having a steam dome, a pair of cylinders and a steam pipe connecting the dome with the cylinders, of a valve interposed in the steam pipe between the dome and the cylinders, a

rod for actuating said valve, a spring carried by said valve casing, a plurality of teeth on the rod, an extension on the spring and adapted to engage the teeth on the rod, a bar connected to the spring and extending into the cab of the locomotive toprovide a means for releasing the spring, an angular extension on the rod intermediate the teeth and the lower extremity of said rod, a sec- 1 0nd rod extending longitudinally of the locomotive, said second rod being provided with a slot the walls of said slot being adapted to be engaged by the angular extension on the first mentioned rod, and slide the second mentioned rod rearwardly, a thereby gradually cutting off the steam spring to normally hold the second menpressure and applying the air brakes. 10 tioned rod in its forward position, means at In testimony whereof I afiix my signature the rear end of the second mentioned rod to in presence of two Witnesses.

control the operation of the air brakes, and IRVING LEl/VIS CLARK. a shoe carried by the lower extremity of the Witnesses:

first mentioned rod to engage a'track trip FRED OSTERMEIER,

and force the first mentioned rod upwardly, JOSEPH WARNER.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G." 

